In Marvel Comics it is highly unlikely that launching him into the Sun would kill him. Not for any reason other than the fact that Hulk can survive the destruction of universes, and has done so on panel more than once.
HE CAN SURVIVE IN SPACE
And while in the comics the Hulk has been launched into space in a pressurized vessel for safety, once the vessel broke the Hulk just got angrier and as a result he got stronger, thus causing his body to adapt into one that can survive anything space throws at it.
8 HULK CAN RESIST UP TO 1 MILLION DEGREES OF FLAME
The normal temperature of the Human Torch's flame is 780 degrees Fahrenheit, and no harm comes to Johnny. Of course, great harm can come to anyone or anything that he comes in contact with.
While the Hulk was easily able to survive the barrage of nuclear weapons, the noise of the explosions and cries of dying people eventually came to bother him. The Hulk returned to his birthplace in New Mexico and sealed himself in a cave with a massive boulder, trapping Banner inside with him for many years.
Softly, she says, “Hey, big guy, sun's getting real low.” She puts out her hand, inviting Hulk to place his in her palm. She reaches up and gently slides her fingers down from his forearm to his hand. With this, the Hulk stumbles around as he transforms back into Bruce Banner.
But they didn't seem to be much use after he wielded the Infinity Stones, as his arm was left forever scarred. Well, Endgame directors the Russo brothers have explained just why the powers didn't work, admitting that the power of the Stones was just too great.
IN THE COMICS, Hulk's jet crash lands on the planet of Sakaar. That leaves him weak and unable to fight back to his full potential, which makes him vulnerable enough to have an obedience disk implanted in his skin. He is quickly made to be a servant to the Red King.
Bruce Banner may be more intelligent than Doomsday, but when he transforms into the Hulk, all his intelligence is converted to brute animal-like power. Though both Doomsday and the Hulk have healing abilities, Doomsday heals much faster. In terms of brute strength, the Hulk has a slight edge.
Unlimited Strength: The Hulk possesses the capacity for essentially limitless physical strength. In proportion to his rage, it grows exponentially towards infinity without never really reaching it.
Impressively, Thor withstood the full might of Superman's heat vision, as the pair traded blows at full strength.
In the debut, Lee chose grey for the Hulk because he wanted a color that did not suggest any particular ethnic group. Colorist Stan Goldberg, however, had problems with the grey coloring, resulting in different shades of grey, and even green, in the issue.
According to the Katch-McArdle equation for basal metabolic rate (BMR), a 48-year-old Hulk during his time on Sakaar at 8'2” and 1400 lbs with several hours of daily elevated heart rate activity (for Hulk, a slow day sitting on his haunches) and no more than 5% body fat would have to consume 25,462 Calories (kcal) ...
Since his cinematic debut in 2008, Hulk has shown he can withstand bullets, missiles and sound-based weapons. Due to the gamma radiation that birthed him, his skin is nearly indestructible and takes massive force to break.
At his base level of strength and anger, the Hulk can run at around 300 miles per hour. There isn't any upper limit to his running speed because the angrier he gets, the faster he becomes. He prefers not to run at such speeds because the ground breaks apart on his feet. He prefers leaping.
Marvel Comics has explained the Hulk's return with the reveal that the hero is actually immortal. Apparently, he always has been. The prologue of Avengers #684 highlights other times that the Hulk or Banner has died, beginning with Banner getting hit with the gamma bomb.
View Larger MapFrom this, I am going to estimate that The Hulk jumped to a height of at least 400 feet (120 meters).
Supporting and rising up despite being weighed down with a force equal to the weight of a star capable of going nova (It carries enough kinetic energy to destroy a solar system). If the star's weight was equivalent to the weight of Sol, the Hulk is capable of lifting 2 octillion tons.
Apocalypse makes his way into this position on the list because he is technically stronger than the Hulk. He also has a multitude of other abilities, including telepathy, telekinesis, and shapeshifting. And that's just touching the surface of his powers.
Enraged, Hulk absorbed the whole radiation of the planet and also gained the so-called Old Power, powerful energy flowing through Sakaar, and it literally transformed him into a living, breathing cosmic bomb capable of completely destroying entire planets from releasing the huge amounts of gamma energy..."The World ...
However, just because Ghost Rider doesn't have any reason to kill the Green Goliath doesn't mean he can't, as hellfire is revealed to be the one thing that can actually kill the Hulk–and the Hulk himself confirmed it.
The polished fighting style of Thanos proved too much for Hulk and his overall brutality and savagery. Hulk had the upper hand for all of two seconds due to the element of surprise before Thanos was able to finish the fight with a few quick blows.
The Hulk has been called the strongest Avenger given his unparalleled, planet-shattering strength, but within the 2099 future of Marvel and DC's crossover universe, the Hulk would be considered the weakest Avenger (for one specific reason).
FIXIT - WEAK. Remember that Gray Hulk might be the weakest version of the Hulk of all-time but there was one other time that Hulk went gray after that original appearance. This was when he turned into Mr. Fixit.